Screw



FIG. 1 is a front elevational view

FIG. 2 is a top plan view

FIG. 3 is a bottom plan view

FIG. 4 is a rear elevational view

FIG. 5 is a left side elevational view; and,

FIG. 6 is a right side elevational view. 

The ornamental design for a screw, as shown and described. 